Chummy fuelling problem

[bob46320]

I am glad that the vent pipe (Roger Chummy) worked,  but I don't understand how the vapour didn't escape from the vent hole in the cap of the float chamber, allowing liquid fuel to manage the float properly.  I have suffered plenty of vapour lock over here in France when the temperatures are elevated.  The RN has a front tank which roasts when the air temp is in the high 30s Deg C.  Done the usual, check ignition, insulated exhausts, insulated fuel lines, no vertical coils in the fuel line, no in-line filter, 4 blade fan but now find that using the 98 grade of petrol instead of the 95 has improved the situation. The get me home fix was to remove the bonnet and put it on the back seat !
Good luck in solving your problem.
Bob